EP1771074A1 - Procede de deshydratation - Google Patents
Procede de deshydratationInfo
- Publication number
- EP1771074A1 EP1771074A1 EP05753065A EP05753065A EP1771074A1 EP 1771074 A1 EP1771074 A1 EP 1771074A1 EP 05753065 A EP05753065 A EP 05753065A EP 05753065 A EP05753065 A EP 05753065A EP 1771074 A1 EP1771074 A1 EP 1771074A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pieces
- water
- gas
- pressurised gas
- dehydrated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 71
- 230000018044 dehydration Effects 0.000 title description 11
- 238000006297 dehydration reaction Methods 0.000 title description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 94
- 239000000463 material Substances 0.000 claims abstract description 44
- 241001465754 Metazoa Species 0.000 claims abstract description 28
- 238000001035 drying Methods 0.000 claims abstract description 20
- 239000002250 absorbent Substances 0.000 claims abstract description 16
- 230000002745 absorbent Effects 0.000 claims abstract description 16
- 239000003463 adsorbent Substances 0.000 claims abstract description 14
- 230000003134 recirculating effect Effects 0.000 claims abstract description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 26
- 238000000605 extraction Methods 0.000 claims description 18
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 14
- 239000001569 carbon dioxide Substances 0.000 claims description 12
- 235000013311 vegetables Nutrition 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 235000013399 edible fruits Nutrition 0.000 claims description 6
- 235000008216 herbs Nutrition 0.000 claims description 5
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 claims description 4
- LVZWSLJZHVFIQJ-UHFFFAOYSA-N Cyclopropane Chemical compound C1CC1 LVZWSLJZHVFIQJ-UHFFFAOYSA-N 0.000 claims description 2
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 claims description 2
- 239000001273 butane Substances 0.000 claims description 2
- MDOAAHGPXOGVQG-UHFFFAOYSA-N ethene;propane Chemical compound C=C.CCC MDOAAHGPXOGVQG-UHFFFAOYSA-N 0.000 claims description 2
- 239000008206 lipophilic material Substances 0.000 claims description 2
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 claims description 2
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 claims description 2
- 239000001272 nitrous oxide Substances 0.000 claims description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 235000013599 spices Nutrition 0.000 claims description 2
- 241000196324 Embryophyta Species 0.000 description 25
- 235000011299 Brassica oleracea var botrytis Nutrition 0.000 description 14
- 235000017647 Brassica oleracea var italica Nutrition 0.000 description 14
- 240000003259 Brassica oleracea var. botrytis Species 0.000 description 14
- 229910021536 Zeolite Inorganic materials 0.000 description 9
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 9
- 239000010457 zeolite Substances 0.000 description 9
- 238000002474 experimental method Methods 0.000 description 8
- 239000007788 liquid Substances 0.000 description 8
- 235000013372 meat Nutrition 0.000 description 8
- 239000000796 flavoring agent Substances 0.000 description 6
- 235000019634 flavors Nutrition 0.000 description 6
- 238000004108 freeze drying Methods 0.000 description 6
- 239000007858 starting material Substances 0.000 description 6
- 239000002904 solvent Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 235000013305 food Nutrition 0.000 description 4
- 150000004760 silicates Chemical class 0.000 description 4
- 238000011282 treatment Methods 0.000 description 4
- 240000009164 Petroselinum crispum Species 0.000 description 3
- 230000002411 adverse Effects 0.000 description 3
- 210000004027 cell Anatomy 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000007602 hot air drying Methods 0.000 description 3
- 150000002632 lipids Chemical class 0.000 description 3
- 235000011197 perejil Nutrition 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 235000005254 Allium ampeloprasum Nutrition 0.000 description 2
- 240000006108 Allium ampeloprasum Species 0.000 description 2
- 235000001270 Allium sibiricum Nutrition 0.000 description 2
- 240000004160 Capsicum annuum Species 0.000 description 2
- 235000008534 Capsicum annuum var annuum Nutrition 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 2
- 241000287828 Gallus gallus Species 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 2
- 229910000323 aluminium silicate Inorganic materials 0.000 description 2
- 235000015278 beef Nutrition 0.000 description 2
- RYYVLZVUVIJVGH-UHFFFAOYSA-N caffeine Chemical compound CN1C(=O)N(C)C(=O)C2=C1N=CN2C RYYVLZVUVIJVGH-UHFFFAOYSA-N 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 235000010980 cellulose Nutrition 0.000 description 2
- 235000013330 chicken meat Nutrition 0.000 description 2
- HVYWMOMLDIMFJA-DPAQBDIFSA-N cholesterol Chemical compound C1C=C2C[C@@H](O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@H](C)CCCC(C)C)[C@@]1(C)CC2 HVYWMOMLDIMFJA-DPAQBDIFSA-N 0.000 description 2
- 239000012632 extractable Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 235000015277 pork Nutrition 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 235000015170 shellfish Nutrition 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 230000004580 weight loss Effects 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 241000143060 Americamysis bahia Species 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 235000007862 Capsicum baccatum Nutrition 0.000 description 1
- 229920001661 Chitosan Polymers 0.000 description 1
- LPHGQDQBBGAPDZ-UHFFFAOYSA-N Isocaffeine Natural products CN1C(=O)N(C)C(=O)C2=C1N(C)C=N2 LPHGQDQBBGAPDZ-UHFFFAOYSA-N 0.000 description 1
- 229920000881 Modified starch Polymers 0.000 description 1
- 206010033546 Pallor Diseases 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- 229930182558 Sterol Natural products 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229960001948 caffeine Drugs 0.000 description 1
- VJEONQKOZGKCAK-UHFFFAOYSA-N caffeine Natural products CN1C(=O)N(C)C(=O)C2=C1C=CN2C VJEONQKOZGKCAK-UHFFFAOYSA-N 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 235000011148 calcium chloride Nutrition 0.000 description 1
- 239000001175 calcium sulphate Substances 0.000 description 1
- 235000011132 calcium sulphate Nutrition 0.000 description 1
- 239000001511 capsicum annuum Substances 0.000 description 1
- 239000001728 capsicum frutescens Substances 0.000 description 1
- 210000003850 cellular structure Anatomy 0.000 description 1
- 235000012000 cholesterol Nutrition 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000007799 cork Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 235000019688 fish Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 235000021374 legumes Nutrition 0.000 description 1
- 238000005360 mashing Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 235000019426 modified starch Nutrition 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000004792 oxidative damage Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003415 peat Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 150000003432 sterols Chemical class 0.000 description 1
- 235000003702 sterols Nutrition 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 229920000247 superabsorbent polymer Polymers 0.000 description 1
- 239000004583 superabsorbent polymers (SAPs) Substances 0.000 description 1
- 239000003039 volatile agent Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
- A23B4/00—General methods for preserving meat, sausages, fish or fish products
- A23B4/03—Drying; Subsequent reconstitution
- A23B4/033—Drying; Subsequent reconstitution with addition of chemicals
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
- A23B7/00—Preservation or chemical ripening of fruit or vegetables
- A23B7/02—Dehydrating; Subsequent reconstitution
- A23B7/0205—Dehydrating; Subsequent reconstitution by contact of the material with fluids, e.g. drying gas or extracting liquids
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L5/00—Preparation or treatment of foods or foodstuffs, in general; Food or foodstuffs obtained thereby; Materials therefor
- A23L5/20—Removal of unwanted matter, e.g. deodorisation or detoxification
- A23L5/23—Removal of unwanted matter, e.g. deodorisation or detoxification by extraction with solvents
Definitions
- the present invention relates to a method of dehydrating pieces of intact plant or animal tissue, such as fruits, vegetables, meat, shellfish or parts thereof.
- the dehydrated pieces obtained by the present method are capable of essentially instant, substantially uniform reconstitution upon the addition of water. Furthermore, the rehydrated pieces obtained after reconstitution exhibit an appearance and structure that is very similar to that of the original pieces.
- the present invention also provides a method of dehydrating a material comprising (i) contacting said material with an extraction solvent to reduce the water content of the material; (ii) separating the solvent from the partially dehydrated material; (iii) drying the solvent thus obtained by contacting said solvent with a water absorbent or adsorbent; and (iv) recirculating the dried solvent to the partially dehydrated material.
- hot air dried products generally do not rehydrate well. Freeze drying typically yields dehydrated products that are superior to hot air dried products in terms of flavour and colour.
- freeze drying is known to cause rupture of cells and to increase the permeability of vegetables to water.
- freeze drying is not particularly economical as it is a very slow process that consumes a lot of energy.
- the prior art has long recognised a need for a simple, effective method for preserving the fresh characteristics of pieces of intact plant or animal tissue.
- an economical dehydration method that does not adversely affect the desirable characteristics of the starting material as a result of e.g. heat induced or oxidative damage.
- the present inventors have found that it is possible to dehydrate pieces of intact plant or animal tissue whilst retaining the fresh characteristics by using a pressurised gas having a pressure of at least 0.5xP c and a temperature of at least T c -60 °C, P c representing the critical pressure of the gas and T c representing the critical temperature of the gas. More particularly, it was found that dehydration by means of pressurised gas yields dehydrated pieces that, after rehydration, exhibit qualities associated with freshness such as natural appearance, flavour, texture and product integrity. At the same time the shelf-life of the dehydrated product is appreciably extended as compared to the untreated product. Furthermore, the dehydrated pieces obtained by the present method rehydrate quickly and easily.
- the inventors do not wish to be bound by theory it is believed that the aforementioned benefits of the present method are associated with the fact that the cellular structure of the tissue remains undamaged throughout the dehydration process. Furthermore, the present process can suitably be operated at relatively low temperatures (e.g. ambient temperature). Thus, the detrimental effects of heat exposure can also be avoided.
- liquefied gas or supercritical gas may advantageously be used to dehydrate water containing materials, particularly materials that contain components that are heat sensitive or that are prone to oxidation. Hot air drying of such materials will cause significant quality loss whereas freeze drying often is not economical.
- US 6,026,565 describes a process for the removal of sterols and/or lipid components from lipid containing food using sub or super-critical fluids. It is noted in the US patent that after a particle reduction step, sub or supercritical fluid is used to remove water. Upon reaching a certain moisture content, fat and cholesterol will also be extracted. It is said that the meat should be dried to the range 30-55% w/w. The examples of the US patent show that significant water removal is accompanied by the extraction of substantial amounts of fat.
- one aspect of the present invention relates to a method of dehydrating pieces of intact plant or animal tissue, said pieces containing at least 30 wt.% of water, the method comprising (i) contacting the pieces of intact tissue with a pressurised gas to reduce the water content of the pieces by at least 50%, said pressurised gas having a pressure of at least 0.5xP c and a temperature of at least T c -60 °C, P c representing the critical pressure of the gas and T c representing the critical temperature of the gas, and (ii) separating the pressurised gas from the dehydrated pieces, wherein at least 80 wt.% of the matter removed by the pressurised gas from the pieces of intact plant or animal tissue is water.
- tissue as used herein in relation to plant or animal tissue means that said tissue is essentially undamaged (although it may have been submitted to e.g. blanching), meaning that the individual cells have not been ruptured and are still interconnected.
- pieces of intact plant or animal tissue encompasses parts of plant or animal tissue that have been removed by cutting, or equivalent techniques, as the tissue within the pieces thus obtained will remain essentially intact.
- gas refers to a substance or element, or to a mixture of substances and/or elements that is/are gaseous at a pressure of 1 atmosphere and a temperature of 20°C and that can be brought into a liquid or supercritical state by increasing pressure to at least 10 atmosphere, preferably to at least 20 atmosphere.
- the benefits of the present invention are particularly pronounced in case the method is employed to dehydrate relatively large pieces of intact tissue. Consequently, in a particularly preferred embodiment of the invention, at least 50% (v/v) of the pieces to be dehydrated have a weight of at least 0.05 g, preferably of at least 0.1 g and most preferably of at least 0.3 g.
- Typical examples of pieces of intact plant tissue that may advantageously be dehydrated by the present method include vegetables, fruit, herbs, spices as well as parts of these plant materials and any possible blends thereof.
- the present method is employed to dehydrate vegetables (including legumes) and fruit.
- pieces of animal tissue that can suitably be dehydrated by the present method include shellfish, shrimps, beef, pork, chicken and fish meat.
- An important benefit of the present method is associated with the excellent rehydratability of the dehydrated pieces obtained therefrom.
- a measure of said dehydratability is the so called rehydration ratio.
- the rehydration ratio is defined as the ratio of the weight of the reconstituted product after 5 minutes of rehydration to the weight of the dehydrated product prior to rehydration.
- the rehydration ratio of the dehydrated pieces obtained from the present method exceeds 3.
- the aforementioned rehydration ratio exceeds 3.5, more preferably it even exceeds 4.
- Another measure of the rehydratability of the dehydrated pieces is the rehydration capacity.
- the rehydration capacity is defined as the quotient of (a) the mass of the rehyrated pieces minus the mas of the dried material and (b) the mass of the fresh material minus th mass of the dried material. Again, the mass of the rehydrated pieces is determined after 5 minutes of rehydration.
- the rehydration capacity is particularly suitable for defining the rehydratability of dehydrated pieces that were obtained from pieces of tissue with a relatively low moisture content (e.g.
- Meat tissue typically has a much lower moisture content than most plant tissues, which is why the rehydration capacity is more suited for defining the rehydratability of dehydrated meat pieces.
- the rehydration capacity of the dehydrated pieces obtained from the present method exceed 0.3. More preferably, the rehydration capacity exceeds 0.33, most preferably said ratio exceed 0.35..
- the dehydrated pieces obtained by the present method contain less than 20 wt.% of water, preferably less than 10 wt.% of water.
- the water activity of the dehydrated pieces obtained by the present method is advantageously below 0.6, especially below 0.3. As compared to, for instance, freeze drying, the present method offers the advantage that the achievable dehydration rate is significantly higher.
- the pieces of intact plant or animal tissue are typically contacted with the pressurised gas for at least 30 minutes so as to achieve a substantial reduction in moisture content.
- adequate dehydration can usually be achieved in 1-12 hours.
- the solubility of water into pressurised gas is rather low.
- the extraction of components other than water may be minimised effectively. Especially if a relatively low volume of pressurised gas is used, said gas will quickly become saturated with extractables other than water, following which further extraction of these extractables will be minimal.
- the water may be removed from the recirculated pressurised gas by any means known in the art.
- the extracted water may be recovered, for instance, by reducing the pressure and/or temperature of the gas so as to substantially decrease the solubility of water therein.
- the water is removed from the pressurised gas by contacting the gas with a water adsorbent or a water absorbent that is immiscible with said pressurised gas.
- the water adsorbent or absorbent may be a liquid or solid, preferably particulate, material.
- suitable adsorbents and absorbents include activated silicates, including activated clays and aluminosilicates; inorganic salts (e.g. calcium chloride, sodium bicarbonate, sodium carbonate and calcium sulphate); superabsorbent polymers (especially polyacrylates; acrylate copolymers, chitosan salts and surfactant-treated polyolefms, e.g. surfactant-treated polypropylene); cellulose, starch and modified starches. It is noted that cellulose and starch may suitably be employed in the form of a natural organic materials, e.g.
- the water is removed from the pressurised gas by contacting the gas with activated silicates, especially microporous silicates (aluminosilicates such as Zeolite 3 A and 4A being particularly preferred), as these silicates are capable of selectively removing water whilst not extracting larger molecules, e.g. flavour molecules, from the pressurised gas.
- activated silicates especially microporous silicates (aluminosilicates such as Zeolite 3 A and 4A being particularly preferred)
- these silicates are capable of selectively removing water whilst not extracting larger molecules, e.g. flavour molecules, from the pressurised gas.
- the applied amount of water absorbent and/or water adsorbent material may suitably be used to control the amount of water that is removed from the pieces of intact plant or animal tissue.
- the efficacy of the present process may suitably be controlled by continuously monitoring the moisture content of the recirculating pressurised gas. For instance, if the moisture of the gas that has been contacted with the pieces of plant or animal tissue drops below a certain preset value, this can be used as an indicator that the process may be discontinued.
- the drying rate may be controlled by removing or adding water absorption/adsorption material (whilst maintaining pressure) and/or by changing the circulation flow rate and/or by diverting a part of the flow so it will pass the water absorbent/adsorbent material.
- the present process employs a high initial flow rate of pressurised gas which is gradually reduced as the moisture extraction progresses.
- the flow rate employed in the present process is at least 5 litres per hour per 100 g of starting material (pieces of intact plant or animal tissue).
- the pressurised gas is percolated across a bed of the pieces of intact plant or animal tissue.
- the bed may suitably consist of a single mass of pieces that have been piled up or heaped together. It may also be advantageous to employ a vertical arrangement of two or more screens onto each of which a layer of the pieces has been deposited.
- the dehydrated pieces are suitably separated from pressurised gas prior to adjusting the pressure and temperature to ambient conditions.
- the adjustment of the pressure and temperature preferably occurs at a sufficiently slow rate to leave the tissue cell structure essentially intact. More particularly, the pressure is advantageously decreased at a rate of not more than 10,000, especially not more than 7,500 Pa/s.
- the present invention also provides a method of dehydrating a material containing at least 30 wt.% of water, the method comprising (i) contacting said material with a pressurised gas to reduce the water content of the material; (ii) separating the pressurised gas from the partially dehydrated material; (iii) drying the pressurised gas thus obtained by contacting said pressurised gas with a water absorbent or water adsorbent; and (iv) recirculating the dried pressurised gas to the partially dehydrated material, wherein the water content of the composition is reduced by at least 50%.
- a method of dehydrating comprising (i) contacting said material with a pressurised gas to reduce the water content of the material; (ii) separating the pressurised gas from the partially dehydrated material; (iii) drying the pressurised gas thus obtained by contacting said pressurised gas with a water absorbent or water adsorbent; and (iv) recirculating the dried pressurised gas to the partially dehydrated material, wherein
- the present dehydration method suitably employs a pressure during contacting of the pieces with the pressurised gas that is close to the critical pressure of the pressurised gas.
- the pressure of the pressurised gas is at least 0.7xP c .
- the pressure of the pressurised gas is at least 0.8xP c .
- the pressure of the pressurised gas will not exceed 10xP c , preferably it will not exceed 5xP c .
- the temperature of the pressurised gas during the contacting with the pieces of plant or animal tissue advantageously is at least T c -40 °C. Even more preferably said temperature is at least T c -30 °C.
- the temperature of the pressurised gas does not exceed T c +60 °C, more preferably it does not exceed T c +40 C. In a particularly preferred embodiment the temperature of the pressurised gas during the contacting step does not exceed 70°C, more preferably it does not exceed 50°C and most preferably it does not exceed 40°C.
- the pressurised gas employed in the present method is a liquefied or supercritical gas. The pressurised gas employed in the present method is advantageously selected from the group consisting of carbon dioxide, nitrous oxide, ethane, ethylene propane, cyclopropane, propylene, butane and mixtures thereof.
- the pressurised gas is carbon dioxide at a pressure of at least 40 bar, and a temperature between 0° and 200°C.
- a liquid or supercritical gas with a low moisture content, e.g. a water content below 0.3 wt.%, more particularly a water content below 0.1 wt.%.
- supercritical gasses such as carbon dioxide
- At least 90 wt.% of the matter removed by the pressurised gas in the present method is water. Even more preferably at least 95% of said matter is water.
- the present invention provides a method in which both the pre-drying and the extraction are conducted with the pressurised gas.
- this specific embodiment of the invention relates to a method as described herein before, wherein the method comprises reducing the water content of the material to less than 10%, followed by submitting the dehydrated material thus obtained to an extraction with the same gas, said gas being in a pressurised state, wherein the extraction removes at least 1% of lipophilic material by weight of dry matter contained in the said material.
- both the drying step and extraction step are conducted within the same equipment, preferably without removing removing the pieces of plant or animal tissue from the equipment until after the extraction has been completed.
- Another aspect of the invention relates to the use of a pressurised gas for dehydrating pieces of intact plant or animal tissue containing at least 30 wt.% of water to obtain dehydrated pieces having a rehydration ratio exceeding 3, said pressurised gas having a pressure of at least 0.5xP c and a temperature of at least T c -60 °C.
- the invention is further illustrated by means of the following examples.
- Example 1 Drying broccoli in batch without circulation
- Example 2 Drying broccoli in batch with circulation Two experiment were performed in a 6 litre vessel which was continuously flushed with CO 2 during the dehydration process by means of a circulation pump. As described in Example 1 , ca. 70g broccoli was deposited - wrapped in polyester cloth - on top of a maze which was placed on top of a bed of 700 g zeolite 3 A. The CO 2 was flushed from the bottom upwards. The vessel was heated with oil via a jacket. The procedure employed was identical to that described in the previous example, except that during the dehydration, the circulation pump was switched on to improve the drying rate. The conditions employed during the experiments and the results so obtained are summarised in the following table:
- Fresh broccoli was cut to pieces with sizes of 1-2 cm. The pieces were blanched for 90 sec. Adhered water was removed via adsorption on paper cloth. The broccoli was placed on four trays and placed in a first vessel. The vessel wall was equipped with electrical heating wire. Zeolite 3A was placed into a second vessel in a cotton holder. The second vessel was equipped with a jacket through which heated water was flushed in order to warm the vessel and contents. The second vessel was connected via the bottom and a valve to the first vessel. The first vessel was connected via the bottom to the inlet of a circulation pump. The outlet of the first vessel was connected to the top of the second vessel, via a valve. In the tube connecting the first vessel and the circulation pump, a liquid trap was placed to remove liquid water during the process.
- a sensor was placed to measure the relative humidity in the carbon dioxide. Also connected to the second vessel was a connection to add carbon dioxide.
- the method involved adding carbon dioxide to the second vessel via a double tube cooler and a membrane pump, allowing the second vessel and contents to warm to 40°C. Next, the connections to the second vessel and circulation pump were opened. Carbon dioxide was added until a pressure of 100 bar was reached. Carbon dioxide was circulated over the zeolite and the broccoli. The humidity sensor was used as an indication of the required duration of the process and the required circulation rate. After 6 hours, the circulation pump was stopped and the pressure was released in 0.5 hour. The broccoli was packed in air-tight bags for analysis. Analysis revealed that the water activity of the dried broccoli was 0.33 and that the rehydration capacity was 0.59 and the rehydration ratio 6.68.
- the weight loss and water activity were measured.
- Example 6 Drying of meat In experiments similar to those described in example 4, meat parts (5-10 mm) were dried. The drying time was 21 hours. The temperature was 38°C, the pressure was 100 bar. The ratio zeolite to meat was 10:1. Dried were pork chop, beef and fillet of chicken. The weight loss was measured. In addition, the water content and fat content, the rehydration capacity and rehydration ratio were determined. Results are shown in table below
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Polymers & Plastics (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Wood Science & Technology (AREA)
- Zoology (AREA)
- Nutrition Science (AREA)
- Health & Medical Sciences (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Centrifugal Separators (AREA)
- Meat, Egg Or Seafood Products (AREA)
- Drying Of Gases (AREA)
- Extraction Or Liquid Replacement (AREA)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05753065A EP1771074B1 (fr) | 2004-06-16 | 2005-06-16 | Procede de deshydratation |
PL05753065T PL1771074T3 (pl) | 2004-06-16 | 2005-06-16 | Sposób odwadniania |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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EP04076777 | 2004-06-16 | ||
EP05753065A EP1771074B1 (fr) | 2004-06-16 | 2005-06-16 | Procede de deshydratation |
PCT/NL2005/000439 WO2005122776A1 (fr) | 2004-06-16 | 2005-06-16 | Procede de deshydratation |
Publications (2)
Publication Number | Publication Date |
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EP1771074A1 true EP1771074A1 (fr) | 2007-04-11 |
EP1771074B1 EP1771074B1 (fr) | 2009-10-14 |
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EP05753065A Not-in-force EP1771074B1 (fr) | 2004-06-16 | 2005-06-16 | Procede de deshydratation |
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US (1) | US8187655B2 (fr) |
EP (1) | EP1771074B1 (fr) |
JP (1) | JP4999682B2 (fr) |
CN (1) | CN100527965C (fr) |
AT (1) | ATE445329T1 (fr) |
AU (1) | AU2005253895B2 (fr) |
CA (1) | CA2570799C (fr) |
DE (1) | DE602005017151D1 (fr) |
DK (1) | DK1771074T3 (fr) |
ES (1) | ES2333605T3 (fr) |
PL (1) | PL1771074T3 (fr) |
WO (1) | WO2005122776A1 (fr) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
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BRPI0620480A2 (pt) * | 2005-12-13 | 2011-11-16 | Unilever Nv | método para a desidratação de um produto alimentìcio fragmentado |
EP2361514A1 (fr) * | 2010-02-19 | 2011-08-31 | Coöperatie Avebe U.A. | Séchage assisté par du gaz sous-critique d'un matériau biopolymère |
WO2011154824A2 (fr) * | 2010-06-12 | 2011-12-15 | Pepsico India Holdings Pvt Ltd | Procédé de production d'un produit alimentaire déshydraté dont la couleur pâle présente un brunissement moins prononcé par comparaison avec un produit alimentaire classique, et système de déshydratation dynamique hybride fermé permettant d'obtenir le produit alimentaire déshydraté |
CA2819579A1 (fr) * | 2010-12-30 | 2012-07-05 | Feyecon B.V. | Procede de deshydratation qui utilise un sel de choline liquide ionique |
JP6414908B2 (ja) | 2013-05-23 | 2018-10-31 | ロングブルーム アイピー ビー.ブイ. | 新鮮な観賞植物の部位を保存する方法 |
DE102013018863B4 (de) * | 2013-11-11 | 2017-06-29 | Deutsches Institut Für Lebensmitteltechnik E.V. | Verfahren und Vorrichtung zur Rohstoffaufbereitung und effektiven Herstellung von Rohdauerwaren auf Fleisch-und Wurstbasis |
SI2940414T1 (en) | 2014-04-29 | 2018-01-31 | Esg Kraeuter Gmbh | Procedure and device for drying plant products |
US10492507B2 (en) | 2017-05-11 | 2019-12-03 | Cornell University | Process for improving shelf-life of fresh cut vegetables and food products produced thereby |
CN108955096B (zh) * | 2018-05-22 | 2020-04-17 | 航天特种材料及工艺技术研究所 | 一种超临界二氧化碳干燥的方法 |
US20190124963A1 (en) * | 2018-11-19 | 2019-05-02 | Darlene Fantel | Dehydrated Edible Meat Chip Snack for Humans and Pets |
CN111982631B (zh) * | 2020-08-27 | 2023-04-07 | 新乡医学院 | 一种病理组织脱水装置 |
Family Cites Families (11)
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US2592038A (en) * | 1950-11-07 | 1952-04-08 | John E Kimsey | Refrigerated display case |
US4167589A (en) * | 1971-06-03 | 1979-09-11 | Otto Vitzthum | Method for the manufacture of caffeine free black tea |
US4335150A (en) * | 1979-06-19 | 1982-06-15 | Chlorine Engineers Corp. | Low temperature food drying process |
GB2150007B (en) * | 1983-11-25 | 1988-02-17 | Basic American Foods | Dehydrated food product |
CA1327907C (fr) * | 1987-08-19 | 1994-03-22 | Owen John Catchpole | Elimination des sterols et des lipides des aliments |
NO893284L (no) * | 1988-08-19 | 1990-02-20 | Corran Norman Stuart Mclachlan | Fremgangsmaate ved fjerning av steroler fra matvarer. |
US5151188A (en) * | 1990-06-12 | 1992-09-29 | The Government Of The United States Of America, As Represented By The Secretary Of The Department Of Health And Human Services | Supercritical fluid extraction enhancer |
US6268012B1 (en) * | 1996-06-07 | 2001-07-31 | Dtl S.A. | Dried product and a drying process |
JPH10338653A (ja) * | 1997-06-06 | 1998-12-22 | Jiyunsei Kagaku Kk | 液体の脱水方法 |
JPH11253997A (ja) * | 1998-03-09 | 1999-09-21 | Nippon Steel Corp | 高効率脱水方法及び高効率脱水装置 |
US6110518A (en) * | 1998-03-12 | 2000-08-29 | Basic American, Inc. | Method for preparing quick-reconstituting foodstuffs which includes subjecting such foodstuffs to freezing followed by thawing and then at least one sequence of freezing and thawing prior to drying |
-
2005
- 2005-06-16 WO PCT/NL2005/000439 patent/WO2005122776A1/fr active Application Filing
- 2005-06-16 CA CA2570799A patent/CA2570799C/fr not_active Expired - Fee Related
- 2005-06-16 EP EP05753065A patent/EP1771074B1/fr not_active Not-in-force
- 2005-06-16 CN CNB2005800271267A patent/CN100527965C/zh not_active Expired - Fee Related
- 2005-06-16 AT AT05753065T patent/ATE445329T1/de not_active IP Right Cessation
- 2005-06-16 US US11/629,699 patent/US8187655B2/en not_active Expired - Fee Related
- 2005-06-16 JP JP2007516409A patent/JP4999682B2/ja not_active Expired - Fee Related
- 2005-06-16 PL PL05753065T patent/PL1771074T3/pl unknown
- 2005-06-16 DK DK05753065T patent/DK1771074T3/da active
- 2005-06-16 DE DE602005017151T patent/DE602005017151D1/de active Active
- 2005-06-16 ES ES05753065T patent/ES2333605T3/es active Active
- 2005-06-16 AU AU2005253895A patent/AU2005253895B2/en not_active Ceased
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Title |
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See references of WO2005122776A1 * |
Also Published As
Publication number | Publication date |
---|---|
DK1771074T3 (da) | 2009-11-23 |
ES2333605T3 (es) | 2010-02-24 |
CN101001533A (zh) | 2007-07-18 |
AU2005253895B2 (en) | 2011-03-17 |
CN100527965C (zh) | 2009-08-19 |
WO2005122776A1 (fr) | 2005-12-29 |
PL1771074T3 (pl) | 2010-03-31 |
US20100260891A1 (en) | 2010-10-14 |
CA2570799C (fr) | 2013-03-12 |
CA2570799A1 (fr) | 2005-12-29 |
JP4999682B2 (ja) | 2012-08-15 |
US8187655B2 (en) | 2012-05-29 |
DE602005017151D1 (de) | 2009-11-26 |
JP2008502347A (ja) | 2008-01-31 |
EP1771074B1 (fr) | 2009-10-14 |
ATE445329T1 (de) | 2009-10-15 |
AU2005253895A1 (en) | 2005-12-29 |
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